Permanent Magnets Patents (Class 335/302)
  • Patent number: 10381139
    Abstract: The present invention discloses a W-containing R—Fe—B—Cu serial sintered magnet and quenching alloy. The sintered magnet contains an R2Fe14B-type main phase, the R being at least one rare earth element comprising Nd or Pr; the crystal grain boundary of the rare earth magnet contains a W-rich area above 0.004 at % and below 0.26 at %, and the W-rich area accounts for 5.0 vol %˜11.0 vol % of the sintered magnet. The sintered magnet uses a minor amount of W pinning crystal to segregate the migration of the pinned grain boundary in the crystal grain boundary to effectively prevent abnormal grain growth and obtain significant improvement. The crystal grain boundary of the quenching alloy contains a W-rich area above 0.004 at % and below 0.26 at %, and the W-rich area accounts for at least 50 vol % of the crystal grain boundary.
    Type: Grant
    Filed: June 17, 2016
    Date of Patent: August 13, 2019
    Assignees: Xiamen Tungsten Co., Ltd., Fujian Changting Golden Dragon Rare-Earth Co., Ltd
    Inventors: Hiroshi Nagata, Rong Yu, Qin Lan
  • Patent number: 10309822
    Abstract: A magnetic level indicator includes a fixed base and a plurality of magnetic elements. The fixed base includes two lateral plates corresponding to each other, a block portion extending from a bottom edge of each of the two lateral plates and an installation space between the two lateral plates. The magnetic elements are pivotally arranged in the installation space and are arranged along an extension direction of each lateral plate. Each of the magnetic elements includes a first surface and a second surface corresponding to each other and includes two stop plates placed corresponding to each other between the first surface and the second surface. The first surface includes a first indication mark, and the second surface includes a second indication mark different from the first indication mark.
    Type: Grant
    Filed: January 16, 2017
    Date of Patent: June 4, 2019
    Assignee: FINETEK CO., LTD.
    Inventors: Ting-Kuo Wu, Chih-Wen Wang, Yoyen Luo
  • Patent number: 10304600
    Abstract: In one embodiment, a permanent magnet includes a sintered compact having a composition represented by the composition formula: RpFeqMrCusCo100-p-q-r-s (where R is at least one element selected from rare earth elements, M is at least one element selected from Zr, Ti, and Hf, p is 10.5 atomic % or more and 12.5 atomic % or less, q is 24 atomic % or more and 40 atomic % or less, r is 0.88 atomic % or more and 4.5 atomic % or less, and s is 3.5 atomic % or more and 10.7 atomic % or less. The sintered compact has a structure having crystal grains constituted of a main phase including a Th2Zn17 crystal phase, and a crystal grain boundary. In the structure of the sintered compact, an average grain diameter of the crystal grains is 25 micrometer or more, and a volume fraction of the crystal grain boundary is 14% or less.
    Type: Grant
    Filed: February 2, 2015
    Date of Patent: May 28, 2019
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yosuke Horiuchi, Shinya Sakurada, Keiko Okamoto, Masaya Hagiwara, Tsuyoshi Kobayashi, Masaki Endo, Tadahiko Kobayashi, Kazuomi Yoshima
  • Patent number: 10262779
    Abstract: Provided is an R-T-B-based magnet material alloy including an R2T14B phase which is a principal phase and R-rich phases which are phases enriched with the R, wherein the principal phase has primary dendrite arms and secondary dendrite arms diverging from the primary dendrite arms, and regions where the secondary dendrite arms have been formed constitute a volume fraction of 2 to 60% of the alloy, whereby excellent coercive force can be ensured in R-T-B-based sintered magnets even when the amount of heavy rare earth elements added to the alloy is reduced. The inter-R-rich phase spacing is preferably at most 3.0 ?m, and the volume fraction of chill crystals is preferably at most 1%. Furthermore, the secondary dendrite arm spacing is preferably 0.5 to 2.0 ?m, and the ellipsoid aspect ratio of R-rich phase is preferably at most 0.5.
    Type: Grant
    Filed: March 28, 2014
    Date of Patent: April 16, 2019
    Assignee: SANTOKU CORPORATION
    Inventor: Takayuki Shimizu
  • Patent number: 10242780
    Abstract: A rare earth based permanent magnet has a sintered compact with R-T-B based composition. The compact has two kinds of main phase grains M1 and M2 having different concentration distributions of R including R1 and R2 respectively representing at least one rare earth element including Y and excluding Dy, Tb and Ho, and at least one from Ho, Dy and Tb. M1 and M2 have a core-shell structure containing a shell part coating a core part. In M1, when the R1 and R2 atom concentrations in the core and shell parts are defined as ?R1, ?R2, ?R1 and ?R2, respectively, ?R1>?R1, ?R2<?R2, ?R1>?R2 and ?R1<?R2. In M2, when the R1 and R2 atom concentrations in the core and shell parts are defined as ?R1, ?R2, ?R1 and ?R2, respectively, ?R1<?R1, ?R2>?R2, ?R1<?R2 and ?R1>?R2. Ratios occupied by the main phase grains having the core-shell structure are 5% or more, respectively.
    Type: Grant
    Filed: February 16, 2016
    Date of Patent: March 26, 2019
    Assignee: TDK CORPORATION
    Inventors: Akihiro Ohsawa, Yasushi Enokido
  • Patent number: 10242781
    Abstract: A method for manufacturing an R-T-B based sintered magnet includes: 1) a step of preparing an R-T-B based sintered magnet material by sintering a molded body at a temperature of 1,000° C. or higher and 1,100° C. or lower, and then performing (a) temperature dropping to 500° C. at 10° C./min or less, or (b) temperature dropping to 500° C. at 10° C./min or less after performing a first heat treatment of holding at a first heat treatment temperature of 800° C. or higher and 950° C. or lower, the R-T-B based sintered magnet material satisfying compositional requirements; and 2) a heat treatment step of performing a second heat treatment by heating the R-T-B based sintered magnet material to a second heat treatment temperature of 650° C. or higher and 750° C. or lower, and then cooling the R-T-B based sintered magnet material to 400° C. at 5° C./min or more.
    Type: Grant
    Filed: December 16, 2016
    Date of Patent: March 26, 2019
    Assignee: HITACHI METALS, LTD.
    Inventors: Teppei Satoh, Futoshi Kuniyoshi, Rintaro Ishii
  • Patent number: 10199145
    Abstract: Provided is a rare-earth magnet containing no heavy rare-earth metals such as Dy or Tb in a grain boundary phase, has a modifying alloy for increasing coercivity (in particular, coercivity under a high-temperature atmosphere) infiltrated thereinto at lower temperature than in the conventional rare-earth magnets, has high coercivity, and has relatively high magnetizability, and a production method therefor. The rare-earth magnet RM includes a RE-Fe—B-based main phase MP with a nanocrystalline structure (where RE is at least one of Nd or Pr) and a grain boundary phase BP around the main phase, the grain boundary phase containing a RE-X alloy (where X is a metallic element other than heavy rare-earth elements). Crystal grains of the main phase MP are oriented along the anisotropy axis, and each crystal grain of the main phase, when viewed from a direction perpendicular to the anisotropy axis, has a plane that is quadrilateral in shape or has a close shape thereto.
    Type: Grant
    Filed: November 12, 2012
    Date of Patent: February 5, 2019
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Tetsuya Shoji, Akira Manabe, Noritaka Miyamoto, Motoki Hiraoka, Shinya Omura, Daisuke Ichigozaki, Shinya Nagashima
  • Patent number: 10036111
    Abstract: A balancer includes a balancer housing coupled to a drum of a washing machine, the balancer housing having an annular channel defined therein, at least one mass movably disposed in the channel, at least one magnet to restrain movement of the mass along the channel when rotational speed of the drum is within a predetermined range, and at least one magnet fixing member coupled to an outside of the balancer housing to receive and fix the magnet.
    Type: Grant
    Filed: January 24, 2014
    Date of Patent: July 31, 2018
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Doo Young Ryu, Won Young Jung, Young Jin Cho, Jeong Hoon Kang
  • Patent number: 9985506
    Abstract: In a method for manufacturing an interior permanent magnet rotor unit, a radial magnetizing part including high magnetic permeability portions and low magnetic permeability portions face a core, and a magnetic field of axial magnetizing parts is applied to the radial magnetizing part in an axial direction of the radial magnetizing part. This causes the magnetic field to enter the core via the radial magnetizing part and cross magnet materials filling insertion holes of the core.
    Type: Grant
    Filed: May 27, 2016
    Date of Patent: May 29, 2018
    Assignee: JTEKT CORPORATION
    Inventor: Yoshiyuki Shibata
  • Patent number: 9892832
    Abstract: The invention discloses a low-cost double-main-phase Ce permanent magnet alloy and its preparation method, and belongs to technical field of rare earth permanent magnet material. The Ce permanent magnet alloy has a chemical formula of (Cex,Re1-x)aFe100-a-b-cBbTMc in mass percent, wherein 0.4?x?0.8, 29?a?33, 0.8?b?1.5, 0.5?c?2, Re is one or more selected from Nd, Pr, Dy, Tb and Ho elements, and TM is one or more selected from Ga, Co, Cu, Nb and Al elements; the Ce permanent magnet alloy has a double-main-phase structure with a low HA phase in (Ce,Re)—Fe—B and a high HA phase in Nd—Fe—B. The double-main-phase Ce permanent magnet alloy of the present invention prepared by using a double-main-phase alloy method greatly lowers the production cost of magnet while maintaining excellent magnetic performances.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: February 13, 2018
    Assignee: CENTRAL IRON AND STEEL RESEARCH INSTITUTE
    Inventors: Wei Li, Minggang Zhu, Haibo Feng, Anhua Li, Shulin Huang, Yanfeng Li, Yachao Sun, Jingdai Wang
  • Patent number: 9892831
    Abstract: The invention provides an R—Fe—B sintered magnet consisting essentially of 12-17 at % of R, 0.1-3 at % of M1, 0.05-0.5 at % of M2, 4.8+2*m to 5.9+2*m at % of B, and the balance of Fe, containing R2(Fe,(Co))14B intermetallic compound as a main phase, and having a core/shell structure that the main phase is covered with a HR-rich layer and a (R,HR)—Fe(Co)-M1 phase wherein HR is Tb, Dy or Ho. The sintered magnet exhibits a coercivity ?10 kOe despite a low content of Dy, Tb, and Ho.
    Type: Grant
    Filed: March 31, 2016
    Date of Patent: February 13, 2018
    Assignee: SHIN-ETSU CHEMICAL CO., LTD.
    Inventors: Koichi Hirota, Hiroaki Nagata, Tetsuya Kume, Hajime Nakamura
  • Patent number: 9837242
    Abstract: A charged particle filter includes a magnetic deflector having a bore along an axis thereof passing through the magnetic deflector from a sample end to a detector end of the magnetic deflector, and through which bore charged particles pass when in use, the magnetic deflector being formed from two magnets positioned around the bore, with a gap between the two magnets, the two magnets each having a linear central section and two ends, each end forming a curved surface, the curved surface having an aspect ratio defined by a height in a range of between one tenth and ten times the gap between the two magnets, and a width in a range of between one tenth and ten times the gap.
    Type: Grant
    Filed: June 6, 2017
    Date of Patent: December 5, 2017
    Assignee: Thermo Electron Scientific Instruments LLC
    Inventor: Alan Ronemus
  • Patent number: 9818513
    Abstract: Provided is a combined type RFeB-based magnet, including: a first unit magnet; a second unit magnet; and an interface material that bonds the first unit magnet and the second unit magnet, in which the first unit magnet and the second unit magnet are RFeB-based magnets containing a light rare earth element RL that is at least one element selected from the group consisting of Nd and Pr, Fe, and B, in which the interface material contains at least one compound selected from the group consisting of a carbide, a hydroxide, and an oxide of the light rare earth element RL, and in which an amount of a heavy rare earth element RH that is at least one element selected from the group consisting of Dy, Tb and Ho in the second unit magnet is more than that in the first unit magnet.
    Type: Grant
    Filed: September 30, 2014
    Date of Patent: November 14, 2017
    Assignee: DAIDO STEEL CO., LTD.
    Inventor: Shinobu Takagi
  • Patent number: 9800114
    Abstract: A substrate transport apparatus including a drive section and a first movable arm assembly. The drive section includes a first motor. The first motor includes a stator and a passive rotor. The first movable arm assembly is connected to the first motor. The substrate transport apparatus is configured for the first movable arm assembly to be positionable in a vacuum chamber with the passive rotor being in communication with an environment inside the vacuum chamber.
    Type: Grant
    Filed: January 18, 2013
    Date of Patent: October 24, 2017
    Assignee: Persimmon Technologies Corporation
    Inventors: Martin Hosek, Tuan Ha, Dennis Poole
  • Patent number: 9773599
    Abstract: The present invention provides an R-T-B based sintered magnet including R2T14B crystal grains wherein; a grain boundary is formed by two or more adjacent R2T14B crystal grains, an R—O—C concentrated part, in which concentrations of R, O and C are higher than those in the R2T14B crystal grains respectively, is in the grain boundary, and a ratio (O/R) of O atom to R atom in the R—O—C concentrated part satisfies the following formula (1): 0.4<(O/R)<0.7.
    Type: Grant
    Filed: February 13, 2013
    Date of Patent: September 26, 2017
    Assignee: TDK CORPORATION
    Inventors: Masashi Miwa, Haruna Nakajima, Ken-ichi Nishikawa, Tetsuya Hidaka, Jun Hagiwara, Chikara Ishizaka
  • Patent number: 9711280
    Abstract: A rare earth sintered magnet is prepared from a corresponding alloy powder, using a mold comprising a die, an upper punch, and a lower punch which is divided into a plurality of punch segments which are independently movable within the die. The method comprises the steps of filling the mold cavity with the alloy powder when one or more selected punch segments are moved to a higher position than the remaining punch segments; moving the selected punch segments down to the position where the selected and remaining punch segments assume the normal shape of the lower punch during the compression step; compressing the alloy powder between the upper and lower punches under a magnetic field while the normal shape of the lower punch is maintained, for thereby molding a compact; and heat treating the compact.
    Type: Grant
    Filed: April 3, 2015
    Date of Patent: July 18, 2017
    Assignee: SHIN-ETSU CHEMICAL CO., LTD.
    Inventors: Eiji Uesaka, Osamu Kohno, Kenji Imamura, Yoshihiro Umebayashi, Takahiro Hashimoto
  • Patent number: 9697984
    Abstract: A charged particle filter includes a magnetic deflector having a bore along an axis thereof passing through the magnetic deflector from a sample end to a detector end of the magnetic deflector, and through which bore charged particles pass when in use, the magnetic deflector being formed from two magnets positioned around the bore, with a gap between the two magnets, the two magnets each having a linear central section and two ends, each end forming a curved surface, the curved surface having an aspect ratio defined by a height in a range of between one tenth and ten times the gap between the two magnets, and a width in a range of between one tenth and ten times the gap.
    Type: Grant
    Filed: October 28, 2015
    Date of Patent: July 4, 2017
    Assignee: Thermo Electron Scientific Instruments LLC
    Inventor: Alan Ronemus
  • Patent number: 9601247
    Abstract: A sintered ferrite magnet comprising main phases of ferrite having a hexagonal M-type magnetoplumbite structure, first grain boundary phases existing between two main phases, and second grain boundary phases existing among three or more main phases, the second grain boundary phases being dispersed in its arbitrary cross section, and the second grain boundary phases having an average area of less than 0.2 ?m2, are produced by calcining, pulverizing, molding and sintering raw material powders having the general formula of Ca1-x-yLaxAyFe2n-zCoz, wherein 1?x?y, x, y and z and n representing a molar ratio are in desired ranges; 1.8% or less by mass of SiO2 and 2% or less by mass (as CaO) of CaCO3 being added to a calcined body after calcining and before molding; and the sintering step being conducted with a temperature-elevating speed of 1-4° C./minute in a range from 1100° C. to a sintering temperature, and a temperature-lowering speed of 6° C./minute or more in a range from the sintering temperature to 1100° C.
    Type: Grant
    Filed: July 24, 2013
    Date of Patent: March 21, 2017
    Assignee: HITACHI METALS, LTD.
    Inventors: Yoshinori Kobayashi, Seiichi Hosokawa, Etsushi Oda
  • Patent number: 9595851
    Abstract: Permanent magnets that form individual magnetic poles are configured by arranging three magnet blocks to be spaced apart from each other circumferentially, the three magnet blocks are each formed such that cross-sectional shapes that are perpendicular to a central axis of a rotor core are radially outwardly convex, and circumferential widths are narrower in magnet blocks that are further away from a magnetic pole center, and the three magnet blocks that are arranged circumferentially are formed to have mirror symmetry relative to a plane that passes through the magnetic pole center and the central axis of the rotor core.
    Type: Grant
    Filed: January 17, 2014
    Date of Patent: March 14, 2017
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Moriyuki Hazeyama, Takuma Sasai, Shinsuke Kayano, Masaya Inoue, Shinji Nishimura, Akihiro Daikoku
  • Patent number: 9514870
    Abstract: A rare earth magnet production method of the present invention includes a placing step of placing a magnet material including a compact or a sintered body of powder particles having a rare earth magnet alloy, and a diffusing material containing a diffusing element to improve coercivity, in a vicinity of each other; and a diffusing step of diffusing the diffusing element into an inside of the magnet material by exposing the magnet material heated to vapor of the diffusing element evaporated from the diffusing material heated; and wherein the diffusing step is a step of heating the diffusing material independently of the magnet material to diffusing material temperature which is different from heating temperature of the magnet material called magnet material temperature.
    Type: Grant
    Filed: February 13, 2012
    Date of Patent: December 6, 2016
    Assignees: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yuji Kaneko, Hisaaki Takao, Yukio Takada, Motoki Hiraoka, Keiu Kanada
  • Patent number: 9490670
    Abstract: A rotor includes first and second rotor cores, a disk magnet, and a rectifying magnet. The first and second rotor cores each include a core base and claw-poles. The disk magnet is magnetized in the axial direction so that the claw-poles of the first rotor core function as first poles and the claw-poles of the second rotor core function as second poles. The rectifying magnet includes at least an inter-pole magnet portion or a back-surface magnet portion. The inter-pole magnet portion is located in a gap formed in the circumferential direction between the claw-poles of the first rotor core and the claw-poles of the second rotor core. The back surface magnet portion is located in a gap formed at back surfaces of the claw-poles. The rectifying magnet and the disk magnet are formed from different materials. The rectifying magnet is integrated with the disk magnet in a post-process.
    Type: Grant
    Filed: September 24, 2014
    Date of Patent: November 8, 2016
    Assignee: Asmo Co., Ltd.
    Inventors: Takahiro Tsuchiya, Chie Morita, Yoji Yamada, Koji Mikami
  • Patent number: 9442109
    Abstract: Centrifugal force based microfluidic systems for the automated analysis of fluids involving the use of magnetically responsive particles and methods thereof are disclosed. A magnet is fixed to a supporting device of the system in correspondence to a retention zone of the system so as to rotate therewith and to generate a magnetic field which magnetically manipulates the magnetically responsive particles contained in a reaction chamber of the system.
    Type: Grant
    Filed: May 17, 2010
    Date of Patent: September 13, 2016
    Assignee: Roche Diagnostics Operations, Inc.
    Inventors: Rijk Edwin Oosterbroek, Mario Curcio, Stephan Korner, Brigitte Niederberger
  • Patent number: 9287029
    Abstract: An array of paired bar magnets (200) provides a reinforced magnetic field (203) on a first side and a nearly canceled magnetic field (204) on a second side of each pair. The array may be a planar array (600) with a plurality of parallel, coplanar pairs (620). The array may provide air gaps between consecutive pairs, and within individual pairs, to provide improved transparency to sound. The array may be doubled (700), with the reinforced fields (713) of one half of the array opposing the reinforced fields (723) of the other half to produce a more intense field (730). In another configuration, the array may be doubled (800) with the nearly canceled fields of one pair facing the nearly canceled fields of the other, producing an array with reinforced fields (801-804) on four sides.
    Type: Grant
    Filed: September 26, 2014
    Date of Patent: March 15, 2016
    Assignee: AUDEZE LLC.
    Inventor: Dragoslav Colich
  • Patent number: 9287027
    Abstract: An objective of the present invention is to provide a rare earth metal-based permanent magnet with improved adhesion properties. A rare earth metal-based permanent magnet of the present invention as a means for achieving the objective has a laminated plating film, and is characterized in that the plating film comprises as an outermost surface layer a SnCu alloy plating film having a film thickness in a range from 0.1 ?m to 2 ?m, the composition of the SnCu alloy plating film is 35 mass % or more but less than 55 mass % of Sn and the rest being Cu, and a base plating film having two or more layers including at least a Ni plating film and a Cu plating film which are formed as the lower layer under the SnCu alloy plating film, and among the base plating film, the Ni plating film is located just below the SnCu alloy plating film.
    Type: Grant
    Filed: May 14, 2008
    Date of Patent: March 15, 2016
    Assignee: HITACHI METALS, LTD.
    Inventors: Yukimitsu Miyao, Tsutomu Nakamura
  • Patent number: 9281105
    Abstract: A permanent magnet has a grain structure that includes a main phase and a grain boundary phase that is primarily composed of a first metal. A second metal that enhances the coercivity of the permanent magnet and a third metal that has a lower standard free energy of oxide formation than the first metal and the second metal are diffused in the permanent magnet, and the third metal is present in the form of an oxide in the grain boundary phase.
    Type: Grant
    Filed: July 13, 2011
    Date of Patent: March 8, 2016
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Noritaka Miyamoto, Shinya Omura
  • Patent number: 9188653
    Abstract: Disclosed is a device for generating a homogeneous magnetic field component Bz along an axis Oz in a spherical zone of interest of center O and radius r includes at least one first ring of axis Oz in magnetic material with radial magnetization oriented in a first direction and extending around an opening giving access to the zone of interest ZI, a second ring of axis Oz in magnetic material with radial magnetization oriented in the first direction and offset along axis Oz from the first ring and the zone of interest ZI, the inner radius and the outer radius of the second ring respectively being smaller than the inner radius and outer radius of the first ring.
    Type: Grant
    Filed: July 13, 2011
    Date of Patent: November 17, 2015
    Assignee: Commissariat A L'Energie Atomique Et Aux Energies Alternatives
    Inventor: Guy Aubert
  • Publication number: 20150123652
    Abstract: The present disclosure provides a magnet device for providing the magnetic density changes/magnetic field changes in relation to a detecting position. The magnet device comprises a magnet member adapted to be mounted on a rotatable shaft and be rotated for producing the magnetic density changes/magnetic field changes in relation to the detecting position when the magnet member is rotating around the rotatable shaft. To concentrate/condense the density of the magnetic density changes/magnetic field changes, the magnet device includes a magnetic flux density concentrator.
    Type: Application
    Filed: April 15, 2013
    Publication date: May 7, 2015
    Applicants: Tyco Electronics Corporation
    Inventors: Salvador Hernandez-Oliver, Qixin Xue, Yao Zhou
  • Patent number: 9007157
    Abstract: A magnetic assembly for use in a housing of an electronic device can include a first and a second magnet and a magnetic shield. The magnetic shield can reduce magnetic flux density from the first and the second magnets that can appear on the outside of the housing. A magnetic hinge assembly can include magnets configured to correlate with the first and second magnets. The magnetic hinge can magnetically attach to the housing by cooperating with the first and second magnets with magnets that can be included in the magnetic hinge.
    Type: Grant
    Filed: August 28, 2012
    Date of Patent: April 14, 2015
    Assignee: Apple Inc.
    Inventors: Florence W. Ow, Jeremy C. Franklin
  • Patent number: 9000871
    Abstract: A case for a tablet-type electronic device, in particular a tablet computer, comprises a casing shaped so as to at least partially cover a rear surface of the device and equipped with fastener members for fastening it to the device; the casing is equipped with a magnetic coupler element, acting from a rear surface of the casing and able to cooperate with a corresponding fastener element carried by a protective cover for the screen of the device, so as to magnetically fasten the cover to the casing on the rear of the device.
    Type: Grant
    Filed: April 13, 2012
    Date of Patent: April 7, 2015
    Assignee: Tucano S.r.l.
    Inventor: Fabio Cencioni
  • Publication number: 20150084727
    Abstract: There are provided a rare-earth permanent magnet, and a method for manufacturing a rare-earth permanent magnet and a system for manufacturing a rare-earth permanent magnet, capable of achieving improved shape uniformity. Magnet material is milled into magnet powder, and the milled magnet powder is formed into a formed body 40. The formed body 40 is calcined and then sintered using a spark plasma sintering apparatus 45, so that a permanent magnet 1 is manufactured. A die unit 46 included in the spark plasma sintering apparatus 45 that performs spark plasma sintering at least includes in one direction an inflow hole 50 configured to receive inflow of part of the pressurized formed body.
    Type: Application
    Filed: March 8, 2013
    Publication date: March 26, 2015
    Applicant: NITTO DENKO CORPORATION
    Inventors: Izumi Ozeki, Katsuya Kume, Toshiaki Okuno, Tomohiro Omure, Takashi Ozaki, Keisuke Taihaku, Takashi Yamamoto
  • Patent number: 8981888
    Abstract: A magnetic body which can reversibly change its magnetic force with a small external magnetic field while having a high residual magnetic flux density is provided. The magnetic body of the present invention has a residual magnetic flux density Br of at least 11 kG and a coercive force HcJ of 5 kOe or less, while an external magnetic field required for the residual magnetic flux density Br to become 0 is 1.10 HcJ or less.
    Type: Grant
    Filed: December 19, 2011
    Date of Patent: March 17, 2015
    Assignee: TDK Corporation
    Inventors: Kenichi Suzuki, Yoshinori Fujikawa
  • Patent number: 8975991
    Abstract: A magnetic attachment mechanism and method is described. The magnetic attachment mechanism can be used to releasably attach at least two objects together in a preferred configuration without fasteners and without external intervention. The magnetic attachment mechanism can be used to releasably attach an accessory device to an electronic device. The accessory device can be used to augment the functionality of usefulness of the electronic device.
    Type: Grant
    Filed: July 24, 2014
    Date of Patent: March 10, 2015
    Inventors: Andrew D. Lauder, Matthew Dean Rohrbach, Daniel J. Coster, Christopher J. Stringer, Florence W. Ow, Jiang Ai, Jonathan P. Ive, Elvis M. Kibiti, John P. Ternus, Sean D. Lubner
  • Patent number: 8970334
    Abstract: There is provided a magnetic substance holding device that controls permanent magnet energy with which it is possible to obtain a strong holding force with a simple structure.
    Type: Grant
    Filed: December 30, 2013
    Date of Patent: March 3, 2015
    Inventor: TaeKwang Choi
  • Publication number: 20150048707
    Abstract: A method for producing a radially anisotropic ring magnet having at least one axial groove on the inner surface comprises using a die comprising a cylindrical, magnetic core, a magnetic sleeve having an axial ridge in alignment with the groove on the outer surface and disposed on an outer peripheral surface of the core, and an outer, cylindrical die member defining a cavity for forming the ring magnet with the magnetic sleeve, and compression-molding magnet powder charged into the cavity while applying a magnetic field in a radial direction, and a radially anisotropic ring magnet substantially having a composition of R-TM-B, wherein R is at least one of rare earth elements including Y, TM is at least one of transition metals, and B is boron, having at least one axial groove on the inner surface, and magnetized such that centerlines between magnetic poles do not overlap grooves.
    Type: Application
    Filed: October 29, 2014
    Publication date: February 19, 2015
    Applicant: HITACHI METALS, LTD.
    Inventors: Nobuyuki HIRAI, Mitsutoshi Natsumeda
  • Publication number: 20150048911
    Abstract: A permanent magnet assembly for an arc driver assembly of an electric switching device, having a permanent magnet and a cover made of electrically insulating material, wherein the cover is connected directly to the permanent magnet.
    Type: Application
    Filed: November 28, 2012
    Publication date: February 19, 2015
    Applicant: EATON ELECTRICAL IP GMBH & CO. KG
    Inventors: Klaus Dauer, Anke Juelich
  • Patent number: 8957669
    Abstract: A magnet held in a magnet holder is constrained against radial or axial instability, or against both, by a shape on either component in contact with complementary shape on the other component, the shaped components generally defining a tab-and-slot arrangement. The magnet component may be a bonded magnet and in one embodiment may be formed in place by injection molding. The magnet also will exhibit improved magnet properties when magnetized to have lines of polarity matching a path defined by the bulk of the magnetic material as governed by the location of tabs on the magnet. The invention is useful in magnet-sensor assemblies found in industrial applications and in automotive applications such as power steering systems.
    Type: Grant
    Filed: May 2, 2011
    Date of Patent: February 17, 2015
    Inventors: Stanley Byron Musselman, Viswanathan Panchanathan, Mitchell L Spencer
  • Publication number: 20150040725
    Abstract: The application discloses a rare-earth permanent magnetic powder, a bonded magnet, and a device using the bonded magnet. The rare-earth permanent magnetic powder comprises 4 to 12 at. % of Nd, 0.1 to 2 at. % of C, 10 to 25 at. % of N and 62.2 to 85.9 at. % of T, wherein T is Fe or FeCo and the main phase of the rare-earth permanent magnetic powder is a hard magnetic phase with a TbCu7 structure. Material volatilization can be avoided effectively during a preparation process of the rare earth permanent magnetic powder, thus improving the wettability with a water-cooling roller during the preparation process and final prepared materials are provided with good magnetic properties.
    Type: Application
    Filed: July 2, 2012
    Publication date: February 12, 2015
    Inventors: Yang Luo, Hongwei Li, Dunbo Yu, Kuoshe Li, Wenlong Yan, Jiajun Xie, Shuai Lu
  • Publication number: 20150042430
    Abstract: A system and method for tailoring a polarity transition of a magnetic structure is provided that involves printing one or more reinforcing maxels alongside one side or both sides of a polarity transition boundary between a first polarity region of the magnetic structure having a first polarity and a second polarity region of the magnetic structure having a second polarity, where printing reinforcing maxels alongside the polarity transition boundary improves the magnetic field characteristics of the polarity transition.
    Type: Application
    Filed: August 18, 2014
    Publication date: February 12, 2015
    Applicant: CORRELATED MAGNETICS RESEARCH, LLC
    Inventors: Larry W. Fullerton, Jacob S. Zimmerman, Robert S. Evans, David P. Machado, Jason N. Morgan, Mark D. Roberts
  • Publication number: 20150028976
    Abstract: The purpose of the present invention is to provide a structure of a rare-earth magnet having high coercivity. In order to solve the problem, a rare-earth magnet according to the present invention comprises sheets of elements bonded with each other through a covalent bond 100 and layers comprising a transition metal element 200 laminated with the sheet 100, wherein a rare earth element is arranged within a plane of the sheets.
    Type: Application
    Filed: March 26, 2012
    Publication date: January 29, 2015
    Applicant: Hitachi, Ltd.
    Inventor: Hiroshi Moriya
  • Publication number: 20150008998
    Abstract: The invention provides a nanocomposite magnet, which has achieved high coercive force and high residual magnetization. The magnet is a non-ferromagnetic phase that is intercalated between a hard magnetic phase with a rare-earth magnet composition and a soft magnetic phase, wherein the non-ferromagnetic phase reacts with neither the hard nor soft magnetic phase. A hard magnetic phase contains Nd2Fe14B, a soft magnetic phase contains Fe or Fe2Co, and a non-ferromagnetic phase contains Ta. The thickness of the non-ferromagnetic phase containing Ta is 5 nm or less, and the thickness of the soft magnetic phase containing Fe or Fe2Co is 20 nm or less. Nd, or Pr, or an alloy of Nd and any one of Cu, Ag, Al, Ga, and Pr, or an alloy of Pr and any one of Cu, Ag, Al, and Ga is diffused into a grain boundary phase of the hard magnetic phase of Nd2Fe14B.
    Type: Application
    Filed: December 27, 2012
    Publication date: January 8, 2015
    Applicants: NATIONAL INSTITUTE FOR MATERIALS SCIENCE, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hidefumi Kishimoto, Noritsugu Sakuma, Masao Yano, Weibin Cui, Yukiko Takahashi, Kazuhiro Hono
  • Patent number: 8928437
    Abstract: A magnetic attachment mechanism and method is described. The magnetic attachment mechanism can be used to releasably attach at least two objects together in a preferred configuration without fasteners and without external intervention. The magnetic attachment mechanism can be used to releasably attach an accessory device to an electronic device. The accessory device can be used to augment the functionality of usefulness of the electronic device.
    Type: Grant
    Filed: September 15, 2012
    Date of Patent: January 6, 2015
    Inventors: Andrew Lauder, Matthew D. Rohrbach, Daniel J. Coster, Christopher J. Stringer, Florence W. Ow, Jiang Ai, Jonathan P. Ive, Elvis M. Kibiti, John P. Ternus, Sean D. Lubner
  • Publication number: 20140375404
    Abstract: A method for producing a sintered R-T-B based magnet according to the present application includes the steps of: providing a sintered R-T-B based magnet body, of which the R mole fraction that is defined by the content of a rare-earth element falls within the range of 31 mass % to 37 mass %; providing an RH diffusion source including a heavy rare-earth element RH (which is at least one of Dy and Tb) and 30 mass % to 80 mass % of Fe; loading the sintered magnet body and the RH diffusion source into a processing chamber so that the magnet body and the diffusion source are movable relative to each other and readily brought close to, or in contact with, each other; and performing an RH diffusion process by conducting a heat treatment on the sintered magnet body and the RH diffusion source at a process temperature of 700° C. to 1000° C. while moving the sintered magnet body and the RH diffusion source either continuously or discontinuously in the processing chamber.
    Type: Application
    Filed: January 17, 2013
    Publication date: December 25, 2014
    Inventors: Futoshi Kuniyoshi, Rintaro Ishii, Ryouichi Yamagata
  • Patent number: 8907752
    Abstract: Accurate and reliable techniques for wirelessly powering a tablet device are disclosed.
    Type: Grant
    Filed: September 12, 2011
    Date of Patent: December 9, 2014
    Inventors: Justin Richard Wodrich, Stephen Robert McClure
  • Patent number: 8907755
    Abstract: R-T-B-based rare earth magnet particles are produced by an HDDR treatment which comprises a first stage HD step of heating particles of a raw material alloy having a composition of R, B and Co in an inert atmosphere or in a vacuum atmosphere and then replacing the atmosphere with a hydrogen-containing gas atmosphere in which the raw material alloy particles are held in the same temperature range and a second stage HD step of heating a material obtained in the first stage HD step in which the material is held in the hydrogen-containing gas atmosphere.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: December 9, 2014
    Assignee: Toda Kogyo Corporation
    Inventors: Nobuhiro Katayama, Hirofumi Kawasaki, Koichiro Morimoto
  • Publication number: 20140354100
    Abstract: A rare earth magnet may include a formed body having magnetic powder containing rare earth metal, the formed body being magnetized, a coating film which is formed on an outer face of the formed body, and a rust preventive treatment layer which is formed on a surface of the magnetic powder in a pore of the formed body. In a manufacturing method for a rare earth magnet, a forming step is performed in which a formed body having magnetic powder containing rare earth metal is formed, after that, a coating film forming step is performed in which a coating film is formed on an outer face of the formed body and, after that, a rust prevention processing step is performed in which rust preventive liquid is impregnated into the formed body.
    Type: Application
    Filed: May 20, 2014
    Publication date: December 4, 2014
    Applicant: NIDEC SANKYO CORPORATION
    Inventors: Yoshifumi FURUTA, Yasushi MIZUSAKI, Katsuyoshi FURUYA
  • Publication number: 20140345408
    Abstract: A sensor device having at least one sensor element, such as a Hall sensor element, and at least one magnet element that can move in relation to the sensor element. The sensor element has a number of differently magnetized regions. The sensor element is configured to issue a sensor signal, which represents a condition defined by a magnetization of a region of the magnet element located in the measurement range of the sensor element. The sensor element determines the condition by means of one of at least three pre-defined sensor signal values.
    Type: Application
    Filed: November 15, 2012
    Publication date: November 27, 2014
    Inventors: Ralf Pfeifer, Andreas Peukert
  • Patent number: 8896310
    Abstract: Methods of fastening a cage with a fastening system in an MRD. One method includes: assembling: a plurality of pole pieces; a plurality of side magnets, the side magnets substantially enclosing the pole pieces and thereby defining a magnetic envelope and enclosed volume therein; a plurality of side walls, the side walls substantially enclosing the side magnets; a plurality of face walls and a plurality of fastening rods; and passing a plurality of fastening rods through at least one of the side magnets and at least one of the pole pieces and fastening them in an effective measure, such that the rods physically interconnects at least one pair of side walls.
    Type: Grant
    Filed: December 28, 2011
    Date of Patent: November 25, 2014
    Assignee: Aspect Imaging Ltd.
    Inventor: Uri Rapoport
  • Publication number: 20140340030
    Abstract: Disclosed herein is a magnetic sheet, including: a plate-shaped magnetic member made of a magnetic material; and a dielectric layer installed in the magnetic member to thereby shield magnetic flux generated in a thickness direction of the magnetic member, in order to provide a noncontact charging system having excellent charging efficiency.
    Type: Application
    Filed: May 13, 2014
    Publication date: November 20, 2014
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Chang Ryul JUNG, Sung Yong AN
  • Patent number: 8884730
    Abstract: A magnetic attachment mechanism and method is described. The magnetic attachment mechanism can be used to releasably attach at least two objects together in a preferred configuration without fasteners and without external intervention. The magnetic attachment mechanism can be used to releasably attach an accessory device to an electronic device. The accessory device can be used to augment the functionality of usefulness of the electronic device.
    Type: Grant
    Filed: September 15, 2012
    Date of Patent: November 11, 2014
    Inventors: Andrew Lauder, Matthew D. Rohrbach, Daniel J. Coster, Christopher J. Stringer, Florence W. Ow, Jiang Ai, Jonathan P. Ive, Elvis M. Kibiti, John P. Ternus, Sean D. Lubner
  • Publication number: 20140327503
    Abstract: Provided is a NdFeB sintered magnet which can be used in the grain boundary diffusion method as a base material in which RH can be easily diffused through the rare-earth rich phase and which itself has a high coercive force, a high maximum energy product and a high squareness ratio, as well as a method for producing such a magnet. A NdFeB system sintered has an average grain size of the main-phase grains magnet is equal to or smaller than 4.5 ?m, the carbon content of the entire NdFeB system sintered magnet is equal to or lower than 1000 ppm, and the percentage of the total volume of a carbon rich phase in a rare-earth rich phase at a grain-boundary triple point in the NdFeB system sintered magnet to the total volume of the rare-earth rich phase is equal to or lower than 50%.
    Type: Application
    Filed: December 27, 2012
    Publication date: November 6, 2014
    Inventors: Masato Sagawa, Tetsuhiko Mizoguchi